Show System Information 
#!/bin/bash
dmesg |more

ip: get current ip address
#!/bin/bash
ifconfig eth0
sed -n 's/.*inet addr:\([0-9.]*\).*/\1/p' 

ping 127.0.0.1
#!/bin/bash
#ping internal loopback address
ping 127.0.0.1

Name Service Lookup
#!/bin/bash
echo "Looking up Mt. San Jacinto College..."
nslookup msjc.edu